from typing import Any, Callable
from uuid import UUID

from fastapi import HTTPException, status
from pydantic import BaseModel, Field

from app.core.config import TABLE_PARTICIPANTS, TABLE_TOPICS


class Link(BaseModel):
    table: str
    value: UUID

    def resolve(self, resolvers: dict[str, Callable[[UUID], Any]]) -> Any:
        resolver = resolvers.get(self.table)
        if resolver is None:
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail=f"Resolver for table '{self.table}' is not registered",
            )
        return resolver(self.value)

    def as_path(self, leading_slash: bool = True) -> str:
        path = f"{self.table}/{self.value}"
        return f"/{path}" if leading_slash else path

    @classmethod
    def from_raw(cls, raw: str) -> "Link":
        text = raw.strip()
        if not text:
            raise ValueError("Cannot parse empty link value")
        normalized = text.lstrip("/")
        table, value = normalized.split("/", 1)
        link_cls = LINK_TYPE_REGISTRY.get(table, Link)
        if link_cls is Link:
            return link_cls(table=table, value=UUID(value))
        return link_cls(value=UUID(value))


class TopicLink(Link):
    table: str = Field(default=TABLE_TOPICS)


class ParticipantLink(Link):
    table: str = Field(default=TABLE_PARTICIPANTS)


LINK_TYPE_REGISTRY: dict[str, type[Link]] = {
    TABLE_TOPICS: TopicLink,
    TABLE_PARTICIPANTS: ParticipantLink,
}